Radio and visual warning device



July 5, 1949. w. s. HALSTEAD 2,475,578

RADIO AND VISUAL WARNING DEVICE Filed Feb. 8, 1945 7 Shets-Sheet lWILLIAM S. HALSTEAD INVENTOR 4 ATTORNEY July 5, 1949. w. s. HALSTEADRADIO AND VISUAL WARNINQ DEVICE 7 Sheets-Sheet 2 Filed Feb. 8, 19.45

me mm Q ffii ffiii WILLIAM. s. HALSTEAD INVENTOR ATTORNEY W. S. HALSTEADRADIO AND VISUAL WARNING DEVICE July 5, 1949.

Filed Feb. 8, 1945 7 Sheets-Sheet 5 W h l mmw w m lL w Du E mm m E ,wwwm wt w wv w at Q m u mm@ M w E l T3 w l l 8 31 1% H Ml l m 5053 mim M 1L I Q a m @Q m 3 TTORNEY W. S. HALSTEAD RADIQ AND VISUAL WARNING DEVICEJuly 5, 1949.

Filed Feb. 8, 1945 7 Sheets-Sheet 6 RADIO 48 BEAM e- FIG. 8'

- (I-ooo o WILLIAM s. HALSTEAD INVENTOR AT TORN EY July 5, 1949. w. s.HALSTEAD 111mm AND VISUAL WARNING-mum 7 Sheets-Sheet 7 Filed Feb. 8,1945 dm 50 1604 FEEmz E NOT .EDUEU Ud llvll ATTORNEY Patented July 5,1949 RADIO AND VISUAL WARNING DEVICE William S. Halstead, Purchase, N.Y., assignor, by mesne assignments, to Farnsworth Research Corporation,a corporation of Indiana Application February 8, 1945, Serial No.576,769

10 Claims.

This invention pertains to a radio signaling device, and moreparticularly to a device wherein a radiotelephone in combination withvisual signaling means is provided.

Further, the invention pertains to a portable device which embraces acombination radiotelephone and electric spotlight or lantern, with theelectric spotlight being capable of automatically flashing synchronouslywith a radio-emitted tone signal so that the device may be used as aradio and visual warning device either on vehicles such as trains orautomobiles, or when used by individuals on the ground.

When the equipment is utilized as a safety aid, the operator mayinitiate operation of the device so that the radio transmitter willautomatically emit a pulsing radio signal, and simultaneously flash ared light, which light is energized in synchronism with the pulsingradio signal. By this means, the engineer of a radio-equipped locomotiveapproaching such a device, either carried by a flagman 0n the ground ormounted at the rear of a preceding train, will receive the pulsing radiosignal, and if the approaching locomotive is within the effective visualsignaling range of the spotlight, the engineer will also see the pulsinglight signal which will flash in synchronism with the pulsing radiosignal.

Further, by means of the device two-way radiotelephone communicationsmay be exchanged between the engineer of the approaching train and thefiagman of the preceding train after reception of the warning signal sothat detailed intelligence can be conveyed.

In this application of the invention, which is illustrative of one ofits uses on railroads as an aid in averting rear-end collisions betweentrains, the device of the invention may be removably .affixed to thelast car of a train, with a remote control connection extending to theinterior of the train.

In one modification of the invention, a radio wave reflector is affixedto the train and is so disposed that when the radio device is properlydisposed in its predetermined operative position on the train, the radiowave reflector, such as a parabolic reflector, will reflect the signalsrearwardly with respect to the train so that the engineman of afollowing train within eflective range of the device may receive thepulsing signal from the train ahead and simultaneously see a flashinglight if within effective range of the light beam.

The spotlight incorporated in the device also may be operated so that aconstant light beam for general illuminating purposes is obtained.

One of the features of the invention is that it is adaptable for routineuse by workmen who can use thedevice as an electric lantern, or as aradiotelephone transmitter and receiver, with use being made of thepulsing light and synchronously-emitted tone signal whenever emergenciesmay require it. Obviously, since the de-- vice is portable, it may beused for communications and warning purposes between trains, betweencrewmen on the ground, or between a train and workmen on the ground. Inthe latter application, one of the devices of the invention may besecured at the front of a locomotive or other vehicle, the reflectorbeing positioned in such manner that the radio beam is directed ahead ofthe locomotive, while a second device as described here is disposed onthe ground in the vicinity of work crews to warn them of the approach ofthe train, as well as to warn the engineer of the presence of the workcrewby means of signals transmitted by the stationar unit in thevicinity of the work crew.

The device normally may employ a portable transmitter and receiver, withconnections being such that when the pulsing unit is to transmit aperiodic warning signal, the equipment is automatically transferred fromnormal receive condition to the pulse transmit condition, with theequipment reverting to the normal receiving condition between pulses. Atransmitter lockout relay may be employed in the receiver circuit sothat if a carrier wave signal from another transmitter is received bythe device, the transmitter lockout relay will automatically cause thepulsing unit to become ineffective as long as the carrier signal isbeing received and simultaneously will cause a visual and/ or audiblecalling or warning signal to become operative on the portable ,device.receiver so that an aural signal of relatively high audible intensitywill be received on the portable device simultaneously with the visualcalling signal. In operation, when the portable device is in use, andanother transmitter, such. as that located on a locomotive or at acontrol station, goes on the air, the portable device will automaticallycease pulsing and a visual calling light and/or an auxiliary audiblecalling device, such as a bell, on the portable device will becomeeffective to draw the attention of the operator to the signal.Thereafter, the loudspeaker or the earphone of a handset incorporated inthe unit will be effective in reproducing any voice communicationscoming in from the other transmitter. A handset is also utilized so thattwo- A loudspeaker is also connected to the way communications mayconveniently be employed.

It is an object of this invention to proVide a radio signaling devicewherein a radiotelephone is used in combination with visual signalin orwarning means.

A further. object of. the inventionis to provide a portableradioteleplione communications system and combination visual signalingor warning means.

A further object of the invention is to provide a portable device whichincludesa-radio transmit ter and receiver, having in combinationalpulsing.

visual signaling indicati g; means operative in combination with itscomplemental transmitten.

A further object of the invention is to provide a communications warningsystem wherein a pulsing radio tone and pulsing visual signal aresimultaneously transmitted from one unit, and the pulsing radio. tonemay be received on a second unit.

A further. object of the invention is to provide a communicationswarning system wherein a pulsing radio tone andvnulsingfvisual'sig'nal'are simultaneously transmittedrfromone unit, andthe pulsing. radio tone may be aurally received onasecond unit, with asecondaural alarmsignal on the second'unit; which second alarm mayrespond to the rece vedfcarner wave energy on the second unit, or maybea pul's'ingsignal oper ating simultaneously with the pulse received' inthe loudspeaker of the second device.

A further object of theinvention is'to provide a. communications and/orwarning system wherein two substantiallyv similar, units as set forthherein are employed so that. there will be mutual interaction betweentwoJor more devices within effective rangeof each other.

A further object of .theinventi'on is to provide a communications andwarning-system by usin'g'a plurality of similar units as set forthherein, wherein said units periodically emita: radio tone signal,withthe receiver of the respective units being periodicallyplacedin'operation between'the pulsesof the radio tone, and a lockout "relaybeing employed in each unit'to prevent automatic als: ing of the,transmitter while a, signal 'is being re ceived from, the second 'unit,fsaidlockout relay also preventing, the transmitter from beingoperativewhen the carrier signal energy'is being received from anothercooperating unit.

Further. and other objectsmay' be,,'and .may be= come apparent fromvafperusal of the'disclosure herein. It is not intended that the specificillus+ trations be used aslimitati'onsexceptfas defined by the spirit ofthesubjoined claims.

In the drawings:

Fig. 1 is an oblique view of one form of acom= bination spotlight andportable vradioteleph'one device embodiedin the present invention.

Fig. 2 is a. side view illustrating a preferred placement of thebatteries and radio equipment inside the case shown in Fig, 1.

Fig. 2A is aside vi'ewoi a modified'formpofa portion of the equipmentshown'in Fig. 2.

Fig. 3 is. an irregular cross section of the hand.- set reelandassociatedcontacts in relation to (the housing.

Fig. 4 is a side elevational view of" the reelde' vice incorporated inthe equipment ofFig. l' and designed to take upsla'ck in aha'ndsetcordwhen not in use.

Fig. 5 isa rear elevationaljview of the. handset cord reel illustrated.in Fig. 4, with the spring coverrplate removed.

' of a train for rear-end warning purposes.

Fig. 6 is a block diagram of the electrical circuits of the combinedspotlight and portable radiotelephone device illustrated in Fig. 1,showing automatic radio and visual signaling means with coordinatedpulsing device.

Fig. 7 is an illustrative schematic circuit diagram ofv the combinedvisual-and radio signaling device shown in Fi 1. w I I i Fig. 8 is aside view of the device embodied in the present invention showing itsuse at the rear Fig. 9 is aplanview of two railway tracks with trainsthereon, illustrating one form of directional radiation patternestablished by the warning device ofFig. 8.

Fig. 10 is a block diagram of a radio communications system similar tothat illustrated in Fig. 6 and including a lockout relay for suspendingautomatic warning pulse transmission during periods in which a signal isbeing received from other}"st atic msf' Referringto the-"drawings;andmore particu larly toFig. 1, there is shown an oblique view of oneillustrative form of the equipment embodied iritheinvention iri'wliicliametal case I2 is provided to holdf'a co'rnbi'nationradio receiver andtransmitter and associated batteries, the placement dtilsofWhicll'w-illhie-described later. A hinged top cover'li' allows 'a'ccessto the interior ofthe case and handle I-6"'-is'- provided-forcarryingpurposes. The louver's i1 give weather protectiontea-loudspeaker n a untec the case and to be described later. Handsetshield-in place by-spri-ngoIip Zl'wheri-notin'us Recessed compartments23 and '24are p'rovided to house the receiver 'l-aB and microphonel-9'Aof the handset I9 and to hold itin 'su ch manner 'that'it will notpro ject by an excessive amountiroin the case when held in=pla'ce bythespring clip i i I An extruded metal cover-2 named to the side of thecase as showng -to heusea-reel employed to automaticallytake-upthesla'ck on t'he multiple conductor cord 28"wh'enthe' handset 1-9 is'notin use. A'protective capZS vVithafretaining chain 30 covers a telescopictype of radi'o antenna when the antenna is mean -use; A- second'prot'ective cap 3| heldby a-i'etaini-n'g 'chai'r'l 32-cover's' amulticonnection receptacle so that. equipment'may-be connected theretotoprovide control' means from a remote=point. A sp'otlight "33 piojectsfrom the front of ease l2 --and 1containsboth' a clear light bulband a red'lightbulb; 'tq-bedescribed1ater.'

Three toggle switches 5 '3'B-;-and 31 provide necessary switchingcontrols'fcr" controlling op erationof 1 different s'ectiens of thefequipment. Toggle-switch 35 applies pdwe to a clear spotlight bulb, totedescribed Figi 2. -Toggle-swith 36 applies power-to the radioeduipment'sdthat either the receiver-or transmitter-maybe" use'di' asdesired by the operator v Toggle-switch? 31 applies power to anautomatic pulsing device to be later described which I causes peri'cdic"operation of the red"lig-ht bulb infspotlight' 3 3 5'and: at th'e sametime causes the synchronize-macro emission of a warning tone signal" atperiodic intervals, such as one or 'two' secondsffurtherf details ofwhich willbe described later; Indents such'asZ-S on the sides of "case12 provide"fasteningmeans in which locking bolts; not illustrated; may.be in:- sertedto hold the equipment infiasuitable shockemounte'd frame'o'n'the -fronti or rear of a trainor other vehicle-, 'as will-'-bedescribed subsequently;

Fig. 2'shows in outline fcrm 't'he 'illustrative placement of thevarious comporienftslvvithin case I 2. The-spotlightii as slicwfiincludes clear light bulb 38, and red light bulb 39, disposed in frontof a common reflector 4I. Handset I9 is shown held in place by thespring clip 2i while loudspeaker 40 is mounted behind the protectinglouvers I'I. Fig. 2 also shows a press-to-talk switch 50 in the handsetI9 which operates a multiple contact relay, to be described later andwhich is a part of transmitter-receiver unit 5| and serves to transferthe radio circuits from the normal receive condition to the transmitposition, as will be explained in subsequent paragraphs. The handset I9is indicated as held in place by spring clip 2i with the recessedcompartments 23 and 24 housing the receiver I93 and microphone I9A.

Space is provided for the battery unit 46 con-.- sisting of A, B, and Cbattteries. The telescopic antenna 48 is shown in its closed position,the top of the antenna being covered by the protective cap 29. The radioreceiver-transmitter 5I is located in the top portion of the case.

.The multiple-conductor handset cord 28 is normally wound around thereel 53 thus taking up the slack which would otherwise protrude from thecase when handset I9 is clipped in place on the equipment. This reel hasassociated with it suitable brushes and contact rings, to be describedin connection with Figs. 3-5 inclusive, and is accessible for serviceand inspection by removing the metal cover 26.

Fig. 2A illustrates an optional arrangement of a portion of the unitwherein the handset I9 employs a loudspeaking type of receiver unit 20which when placed in the position indicated, provides suflicient soundenergy to take the place of the loudspeaker 40, Fig. 2. A suitable horn20', Fig. 2A, extends downward as shown from the receiver unit 26 to theopenings in the louvers I'I, thereby providing a weatherproof horn-typeloudspeaker.

Fig. 3 is an irregular cross-sectional view of the reel device employedto take up the slack of the handset cord. Reel 53 is provided with amoulded center disc 63 into which are imbedded five contact rings suchas 65. The terminating end of the handset cord (not shown) passesthrough the opening 61 of the reel, while the five conductors of thecord are soldered to contact pins such as 68 which connect through themoulded insulated center disc 63 to their respective contact rings suchas 65.

A center bushing III is moulded into the insulated center piece 63 androtates with it on fixed shaft H, said shaft being suitably secured tothe extruded metal cover 26 previously described in connection withFigs. 1 and 2. A locktight screw I3 secures the reel 53 to the shaft I Iwasher 13A being positioned between the screw-head I3 and the end ofshaft II to permit free rotation of bushing without loosening screw 13.

A removable cover 69 is attached to the side of the reel to hold inplace the coiled spring I4, one

end of which is fastened to the shaft II by rivet I6, and the other endof spring 14 being fastened to cover 69 by rivet l5.

The contact assembly 88 consists of five spring contacts such as 19secured to the insulating plate 8| by means of rivets such as 83. Aninsulated backplate 82 separates the contact assembly 88 so that therivets such as 83 will not be shorted when the assembly is held in placeon metal supporting partition 84 disposed within the case I2 and whichseparates the reel compartment from the radio and battery space in thecase I2, Fig. 2.

Fig. 4 illustrates a side view of the reel 53 in combination with brushor spring contact assembly 88. This view clearly shows that center screw13 holds the reel 53 on a center shaft 1 I, with the contact rings suchas 65 being moulded into the center section 63 as is also shown indetail in Fig. 3. The brush or spring contact assembly 88 as shown isprovided with five spring contacts or brushes such as 19, fastened to aninsulating strip 8| by means of rivets such as 83. Projections such as86 are provided on the spring contact I9 to facilitate their use assoldering terminals for the connecting wires between the handset cordand the radio equipment.

Fig. 5 is a view of the opposite side of the reel 53 as shown in Fig. 3but with the cover 69 removed and illustrates the use of a coiled springE4 to cause rewinding of the handset cord previously described. Thespring 14 is normally held in position on the shaft II by the rivet I6with a similar rivet 15 normally being used to secure the other end ofthe spring to an extruded metal cover 69, as is shown in Fig. 3.

Fig. 6 is a block diagram of the electrical circuits of the equipment inwhich the battery unit 46 connects through switch 35 to clear spotlightbulb 38. Switch 36 connects the battery unit 46 to the transmit-receiveswitch 96 and to the transmitter receiver unit 5I, or component radioreceiver section 5IA and cooperative radio trans,- mitter section 5IBwhich for reason of clarity in illustrating the block diagram arerepresented as two separate units but which in actual practice mayconsist of a single unit with the transfer switch 96 being used in anywell-known circuit to change the circuit functions from the normalreceive operation to the "transmit operation. For clarity, an antenna 48is indicated as connected to either the receiver section 5I A or thetransmitter section 5IB. In the case of a transceiver the antennacoupling to the transmitter may be the same as the antenna coupling tothe receiver, as shown in Fig. 7, effecting a single antenna connectionwith both the transmitter and receiver circuits and operable with eitheras determined by the position of the transmit-receive switch 96, Fig. 6.

The receiver section 5IA is provided with a loudspeaker 4D and anearphone I9B, the latter normally being a part of a handset I9previously described. The transmitter section 5B is provided with amicrophone I 9A, and a press -to-talk switch 50, both of which maynormally be incorporated in the above-mentioned handset l9 as previouslydescribed.

Switch 31 connects the battery unit 46 to an automatic pulsing deviceI06 which may be of any well known construction such as a bi-metalthermostatically controlled switch or other suitable circuit interrupterof alternate make and break type operated by an electrical motor orspring driven mechanism. The automatic pulsing device I06, periodicallyand momentarily connects battery unit 46 to red light bulb 39 andconcurrently or simultaneously energizes the transmitter 513 throughtransfer switch 96 and also connects the output circuit of a tonegenerator I09 to the signal input circuit of the transmitter 5IB,thereby affecting the periodic emission of a radio carrier modulated bythe tone signal simultaneously with emission of a visual warning signalfrom red light 39.

Thus, in emergencies, trainmen from a derailed train or the operator ofa truck or other vehicle which may have stopped in a traffic lane insuch position as to form a trafiic hazard, may use the automatic warningdevice embodied in the pres- &4155518 ent .invention to repetitivelyandautomatically convey both a visualwarning signal of a distinctivecharacteristic toon'comingtrafiic and a radio warning signal which maybe received in approaching vehicles as a distinctive tone signal whoseaudible characteristics .are such that they may readily be reproduced bya loudspeaker in the vehicle.

The illustrative schematic radio circuit, Fig. '7, consists of atransciever combination in which the same tubes and many of the samecircuit .components are used for both receiving and transmitting, asdetermined by the operation of a transfer switch 96 to changecircuitconnections. This change from the normal receive to the transmitposition is accomplished in the present instance by a multiple-contacttransmit-receive relay 96 or other suitable transfer switch as will bedescribed in detail in subsequent paragraphs.

The toggle switch 35 connects the positive terminal II2 of a -6-volt Abattery to the spotlight bulb 38. The toggle switch 36 is a two-poleswitch in which arm IIB connects the -6-volt A battery terminal I I2 tothe filaments of the radio transceiver vacuum tubes and arm II'Iconnects the positive terminal N3 of a 90-volt B battery to the platecircuits of the vacuum tubes in the radio equipment. Terminal H4connects the A and B to ground so that all battery circuits arecompleted to a common ground as indicated in the drawing.

The toggle switch 31, is of three-pole construction, through which armI64 causes application of 6-volts from positive terminal II; to thepulsing device or interrupter I06 when switch 36 also is closed. Arm I61of switch 3,! closes the ground-return circuit of red light 39. Arm 110of switch 31 connects the positive terminal '3 to the radio transceiveras will be explained in more detail in subsequent paragraphs.

Movable contact I23 of relay 96 when in the transmit position connectsto contact I56 thereby connecting the plate circuit of tube I2I toterminal I39 of transformer I38 which in the transmit connection servesas a modulation transformer. Terminal I4'I of transformer I38 connectsto movablecontact I44 of relay96. and makes contact with contact I58when the relay is in transmit position, connecting the positive Bterminal II3 to the plate of tube I2I through winding M0 of transformerI38. Movable contact I60 of relay 96 in transmit position connects withcontact I6I and applies A battery voltage to microphone .I9A throughwinding I63 of transformer I26. former I26 functions as an interstageaudio transformer when Winding I 25, isconnected inthe receive positionand serves as a microphone transformer when windin vH53 is connectedwith the microphone I9Ain the transmit position.

When switch 3'! is closed in conjunction with switch 36, the pulsingcircuit of the equipment is placed in operation, switch contact I64connecting the 6-volt battery circuitto the pulsing unit I86, in thisinstance indicated .as a bi-metallic type of intermittent contactswitch. The positive terminal N2 of the 6-.volt batterycircuitconnectsthrough the resistor wire I66, to. both the winding of relay 96 and-thered light 39. The circuit to the Winding of relay 96 is then completedto ground, whilethe ciIfQuitto the red light 39 is-completed to groundthrough the arm t6! of. switch 31. The purpose of switch-arm I61 bein oprevent the, red light .3.9, rom operatin It will be seen that trans;-

8 when theipress-to-tallg switch 58 on the handset 1191s p essed Whilemakin a voice l f ell missioll- FI'he arm I10. on switch .31 whenclosedconnects the. positive terminal I I3 of the 3 battery to move ablecontact I'H of relay .96 and when relay 96. is

closed, connects with contact H3, applies plate voltage to the tonegenerator tube I12.

The audio-frequency output from the tone generator I12 is coupledthrough capacitor I'M to terminal I15 on the audio driver transformerI3I.

-'I he operation of the automatic pulsing unit I06 is such that whenboth switches 36 and 3 are closed the radio equipment is automaticallytransferred atregular. periodic intervals from the receive position tothe transmit position, with red light 39 being energized during thetrans,- mit period. During the receive period, ree sistance Wire I66drops the voltage across the relay 96 and the red light 39 so that theydo not effectively operate. As the resistance wire I66 heats thebi-metallic contact arm I16, the contacts III close, shorting resistanceI66 and pro.- viding full voltage to operate the relay 96 and the redlight 39 for a short interval until the cooling of bi-rnetallic contactarm again opens contacts I'll, causing opening of relay 96 and dimmingof light 39 below the threshold of vision. This cycle is repeated at anydesired interval, which may be controlled by adjusting the spacing ofcontacts Ill. Other electrical or mechanical means may be provided tointermittently operate the'combined light and radio signal, such as anywell-known electric or spring-driven device.

The remote control unit I85 consists of another handset unit I9comprising earphone I9B, microphone 19A and press-to-talk switch Fill,radio control switch 36' and pulse control switch 31' connected to amulti-contact male plug I84, Which when in the receptacle I83 place allof the above-mentioned remote units in parallel with the handset I9 andswitches 36 and 31 on the transmitter-receiver unit. Therefore, it willbe seen that the remote, unit I85 may duplicate the performance ofhandset I9, switch 36 and switch 3 1 as previously described.

It may be pointed out that the circuit indicated in block diagram Fig. 6and schematic diagram, Fig. 7, is purely representative and thatseparate transmitter-receiver units or other combinations of tubes andswitching means may readily be employed to obtain satisfactory .rcsul s-Fig. 8 shows one manner in whichthe case I2 maybe attachedby clampsl92lon a suitable supporting frame I9I at therear of a train or othervehicle to provide a combination visual-radio warning signal,bothofpulsing characteristics, as previously described. A parabolicreflector I94 .r'nay be placed at the rear of the unit and positioned sothat it isat anefiective reflector location with respect to the antenna.48, thereby producing a 'rearwardly-directed radio beam extendingdirectionally along the light beam from case l2 where such'directionalradio pattern is desired for rear-end warning purposes.

A multiple conductor cable I96 with a male plu :l84,.pr i01 y d s ribein reference to Fi 'l, connects thecase [2 to the remote control I85,Fig. 8, said remote control consisting of; a hand .set19' a d sw tchsfififand-.315. as pr v o sl desc b d. i conn t on withi 7- When the uit s ed. in v th ma usr indicate .9. ed in Figs. 8 and 9, it can operateas a radio transceiver or a combined pulsing red signal light and radiowarning device.

Fig. 9 shows a View of a two-track railroad right of way with trains 20Iand 202, moving in opposite directions in which the rear car I98 oftrain 20I is equipped with a combined radiolight unit and parabolicradio reflector as described in Fig. 8. A portion of the approximateradiation pattern is indicated by the dotted line I99, Fig. 9. I

Figure 10 illustrates a block diagram somewhat similar to that shown inFig. 6 but including only the radio and pulsing units to which has beenincorporated a transmitter or pulse lockout feature.

In the figure, the receiver 5IA and the transmitter SIB are indicatedconnected to the antenna 48 through an antenna transfer relay 99although in the case of a transceiver both the receiver 5| A andtransmitter 5IB may consist of a single unit whereby the antennatransfer relay 99 is not required.

The handset I9 is provided with an earphone unit I9B which is connectedto the receiver output in conjunction with the loudspeaker 40, amicrophone I9A which connects to the transmitter 5| B and apress-to-talk switch 50 which controls the operation of the antennatransfer relay 99 and the plate power transfer relay I00. pulsing unitI06 is controlled by the operation of a pulse control switch IOI. Whenthe switch "II is closed the pulsing unit I06 operates the plate powertransfer relay I and the antenna transfer relay 99 simultaneously withthe tone generator I09, causing the transmitter to send out a tone pulseat intervals, such as every alternate second.

On the alternate second between pulses the equipment is in the receiveposition.

In addition to the speaker output circuit of the receiver I A, a secondoutput is provided for the purpose of operating a transmitter lockoutrelay I02 so that any incoming signal will operate the visual callingsignal I05, and/or an auxiliary audible calling device such as a bellI05A also controlled by relay I 02 and placed in operation upon closurethereof, thereby providing both visual and aural calling means. A switchI05B is inserted between relay I02 and bell I05A to permit the operatorto take the bell out of operation after a call has been received, Thetransmitter lockout relay I02 also connects to the pulsin unit I06 sothat if the pulsing feature is in operation it will be made inoperativeby locking it out of the circuit, thereby allowing the reception of anyincoming signal.

What I claim as new and desire to secure by Letters Patent of the UnitedStates is:

1. As an article of manufacture, a housing and,

contained therewithin, a battery, a radio transmitter and a radioreceiver energized by said battery, loudspeaker means actuated by saidreceiver, a light source energized by said battery, a pulse generatorconnected between said battery and said light source and saidtransmitter respectively so as to pulse the respective outputs thereof,first switching means mounted upon the exterior of said housing forenergizing said transmitter and said light source, an antenna fed fromsaid transmitter, a hand set including a microphone connected tomodulate said transmitter, and an earphone actuated from said receiver,and second switching means automatically actuated in timed relation tosaid first switchin means Thefor alternatively connecting saidtransmitter and said receiver to said antenna. I

2. As an article of manufacture, a housing and, contained therewithin, abattery, a radio transmitter and a radio receiver energized by saidbattery, loudspeaker means actuated by said receiver, a light sourceenergized by said battery, a pulse generator connected between saidbattery and said light source and said transmitter respectively so as topulse the respective outputs thereof, first switching means mounted uponthe exterior of said housing for energizing said transmitter and saidlight source, an antenna fed from said transmitter, a hand set includinga microphone connected to modulate said transmitter and an earphoneactuated from said receiver, and second switching means foralternatively connecting said transmitter and said receiver to saidantenna.

3. In a combination radio transceiver and light beam signaling deviceincluding a radio transmitter, a radio receiver, a light source, and apower source, pulsing means for periodically and synchronously excitingsaid transmitter and said light source, means for directin the output ofsaid transmitter and said light source predominantly over substantiallya single path. switching means for alternatively exciting saidtransmitter and said receiver, transducer means connected respectivelyto said transmitter and said receiver, switching means for putting intooperation said pulsing means, and an audio tone generator connectedbetween pulsing means and said transmitter, whereby the output of saidtransmitter is modulated at audio frequency and pulsed.

4. In a signaling system of the class described, the combination whichincludes, a power source, a pulse generator controlling the outputthereof during transmission, a signaling light and a tone generatorcontrolled by said pulse generator, a transmitter fed from said powersource and modulated by the pulsed output of said tone generator, meansfor directing the respective outputs of said light and said transmitterpredominantlyover substantially a single path, a receiver fed from saidpbwer source and switching means for alternatively connecting saidtransmitter and said receiver respectively to radiate and to re veenergy along said path.

5. In a signaling system of the class described, the combination whichincludes, a radio transmitter, a radio receiver and a calling signalactuated by the output of said receiver, relay means for alternativelyexciting said transmitter and said receiver, means for modulating saidtransmitter, pulsing means for simultaneously causing intermittentexcitation of said modulating means and said relay means, and atransmitter lockout relay actuated by the output of said receiver uponreception of a calling signal and connected to said pulsing means so asto suspend the operation of said pulsing means upon the reception of asignal.

6. In an automatic break-in signaling system, the combination whichincludes, a transmitter, a receiver, an antenna, relay switching meansfor alternatively connecting said transmitter and said receiver to saidantenna, a pulse generator intermittently energizing said transmitterand simultaneously actuating said switching means so as to connect saidtransmitter to said antenna, and a transmitter lockout relay actuated bythe output of said receiver and connected to said pulse generator so asto de-energize said generator upon the reception of a signal during aninterval between transmitted pulses.-

7. In an automaticbreak-in signaling system, the combinationzwhichincludes, atransmitter, a receiver, an antenna, first relay switchingmeans for alternatively connecting said transmitter and said receiver tosaid antenna, a power Source, second relay switching means foralternatively connecting said power source to said transmitter and saidreceiver synchronously with the re spective connection of said antennato said transmitter and saidreceive-r,a pulse generatorintermittentlymodulating said transmitter and simultaneously actuatingboth said switching means so as to connect said transmitter to saidantenna, and simultaneously to connect said transmitter to said powersource, and a transmitter lockout relay actuated by the output of saidreceiver and connected to said pulse generator so as to deenergize saidgenerator upon the'reception of a signal during an interval betweentransmitted pulses. 8-. In a signaling system of the class described,the combinationwhich includes, an antenna, a radio transmitter, a'radioreceiver having at least one plate circuit, anantenna transfer relay anda'plate power transfer relay, a pulse generator simultaneouslyactuatingboth said relays and modulating said transmitter, and atransmitter lockout relay actuated bysaid receiver and connected to andcontrolling the operation of said pulse generator, whereby theconnection of said receiver to said antenna and the excitation of theplate circuit of said'receiver is made during an interval betweentransmitted pulses, and whereby the reception of a signal during saidinterval actuates said transmitter lockout relay and causes said pulsegenerator to cease operation during said reception. v

9. As anarticle of manufacture, a housing, and secured thereto, thefollowing:. a battery, a radio transmitter anda rad-i receiver energizedby said battery, a loudspeaker actuated by said receiver, a light sourceenergizedv by said battery, a pulse generator connected betweensaid-battery and said light sourceandv said transmitter respectively soas to pulse the respective outputs of said light source and'saidtransmitter, first switching means controlling; the operation of saidtransmitter and said light source, an antenna fed-from 1 2 saidtransmitter, a. handset including a microphone connected to. modulatesaid transmitter and an earphone actuated from saidreceivensecandswitching means -tor alternatively connecting said transmitter and saidreceiver to said antenna, an extensible flexible multi-conductor cordconnecting said handset to the elements within said housing, and meansfor automatically taking up the slack of saidcord. v 10. Asanarticleotmanufacture, a housing, and secured thereto the following: a batteryyaradio transmitter and a radio-receiver energized by said battery, aloudspeaker actuated by said receiver, a lightsourceenergized by saidbattery; 2121311136 generatorconnectedbetween said battery and saidlight source and said transmitter respee= tively-so as to pulse therespectiveoutputs-thereof, switching means-controlling the operation ofsaid transmitteran-d said light source, an antenna fed from saidtransmitter, ahandset including a microphone connected to modulate saidtransmitter, and an earphone actuatedfrom said receiver, switching meansfor alternatively 6011-, necting said transmitter andsaid receiver tosaid antenna, a second light source, and a Switch connecting said-secondlight source directlyto said battery. P I WILLIAM S. HALSTEAD:

, REFERENCES- CITED- The following referenlces are 'of record in the fle of this patent: I

UNITED STATES PATENTS

